Bonus Questions for Motor Dynamics

These are worth only a small number of points but still intreating to consider. Please limit response to a total of 1 page.

Take a Close Look at the Motor Stall Torque Setup

1. Why is the stall torque change slightly when measured at different rotor position. Can you find the term for this (search the Internet)

2. When you turn on the motor during the stall test you may notice the current values slowly decreasing. Why is this?

3. If you move the motor supply from 5VDC to the 12VDC plug on the power supply, you will not notice a big change in the measured stall torque. Why is this?